# CVE-2021-24159: Contact Form 7 Style <= 3.1.9 - Cross-Site Request Forgery to Stored Cross-Site Scripting

> An attacker can trick an administrator into updating CSS settings with malicious JavaScript via CSRF, leading to stored XSS and potential site compromise.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 5 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-mw7f-7hv9-rrf6

## What is CVE-2021-24159?

CVE-2021-24159 is a high-severity vulnerability in Unknown Contact Form 7 Style, published on 5 Apr 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Due to the lack of sanitization and lack of nonce protection on the custom CSS feature, an attacker could craft a request to inject malicious JavaScript on a site using the Contact Form 7 Style WordPress plugin through 3.1.9. If an attacker successfully tricked a site’s administrator into clicking a link or attachment, then the request could be sent and the CSS settings would be successfully updated to include malicious JavaScript.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-24159?

It affects 1 product.


Products: Rocklobster Contact Form 7.

## How do I fix CVE-2021-24159?

No fix has been published for CVE-2021-24159 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24159 being exploited?

There is no known exploitation of CVE-2021-24159 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Contact Form 7 Style

- [CVE-2020-35489](https://insights.sbomify.com/CVE-2020-35489/): File upload in n/a (critical 10.0)
- [CVE-2018-20979](https://insights.sbomify.com/CVE-2018-20979/): Privilege escalation in n/a (critical 9.8)
- [CVE-2023-6449](https://insights.sbomify.com/CVE-2023-6449/): Contact Form 7 <= 5.8.3 - Authenticated (Editor+) Arbitrary File Upload (medium 6.6)
- [CVE-2024-4704](https://insights.sbomify.com/CVE-2024-4704/): Contact Form 7 < 5.9.5 - Unauthenticated Open Redirect (medium 6.1)
- [CVE-2024-2242](https://insights.sbomify.com/CVE-2024-2242/): Contact Form 7 <= 5.9 - Reflected Cross-Site Scripting (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24159 and fix it if it is affected.

What it is: CVE-2021-24159 is a high-severity vulnerability in Unknown Contact Form 7 Style, published on 5 Apr 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24159 in the wild and no public exploit code.

Affected product: Unknown Contact Form 7 Style. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-24159/ (Markdown: https://insights.sbomify.com/CVE-2021-24159/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24159
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24159
- OSV: https://osv.dev/vulnerability/CVE-2021-24159

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24159/
Summaries are generated and may contain mistakes; the official description above is the record.